Instructions

In a large bowl, whisk flour, powdered sugar, baking soda and 1/4 teaspoon salt until well combined. Cut in cold butter with a pastry blender or two knives until mixture resembles coarse crumbs. Press mixture evenly in bottom of prepared baking pan (the mixture will seem loose, but it hardens as it bakes and cools). Bake 15-20 minutes until crust is lightly browned. Transfer to a cooling rack while you prepare the filling.